6th RM- Decimal Day

Responsive Math

6th Grade

1/11/2021

Have scratch paper ready!

Check in Question: What is your goal for next week's IA? (Answer in Chat!)

Decimal Day Agenda!

• Adding Decimals Review and CFU

• Subtracting Decimals Review and CFU

• Multiplying Decimal Review and CFU

• Practice

• Last 5 and Close- Out

Part 1

Adding Decimals

Multiple Select

Which problem was solved correctly?

Key Point #1

To add, digits must be in the same place value

Answer #1

Part 2

Subtracting Decimals

Multiple Select

Which problem is solved correctly

Key Point #2

To subtract, digits must be in the same place value

Open Ended

CFU #2: Jeff subtracted 4.3 from 9.85 and got a difference of 9.42. Did he subtract correctly? If yes, how do you know? If no, explain the mistake he made and provide the correct work.

Answer #2

Jeff subtracted incorrectly. He made the mistake of not subtracting digits in the same place value. The answer should be 5.55.

Part 3

Multiplying Decimals

Multiple Select

What is the product of 3.45 and 0.08?

• 0.276

• 2.76

• 27.6

• 276

• 2,760

Key Point #3

To multiply, the number of decimal digits in the factors will be the same as the number of decimal digits in the product

Answer #3

The total amount of liquid is 2.6668 liters.

Practice!

Criteria for Success

• When adding and subtracting, digits are lined up by place value

• When multiplying, decimal point is placed correctly in answer

• Estimation used to check

Multiple Choice

6.09 - 1.23 =

• 5.36

• 4.86

• 5.26

• 4.0

Multiple Choice

0.65 × 1.2 =

• 78

• 7.8

• 0.78

Multiple Choice

3.7 - 1.24 =

• 2.54

• 2.50

• 3.46

• 2.46

Multiple Choice

21.56 - 9.56 =

• 15

• 17.43

• 15.40

• 12

Multiple Choice

9.08 + 14.6 =

• 23.16

• 23.68

• 19.50

• 24.68

Multiple Choice

What is the product of 0.5 and 3.5?

• 0.14

• 1.75

• 7

Multiple Choice

Alexis rode her bike 4.5 miles. Johnny rode his bike 8.1 miles. How many more miles did Johnny ride his bike?

• 3.6

• 2.7

• 4.6

• 12.6